Terms And Data For Servomotors With Gears - YASKAWA SGDH User Manual

3 Specifications and Dimensional Drawings

3.9 Terms and Data for Servomotors With Gears

(1) Terms for Servomotors With Standard Backlash Gears and Low-backlash Gears
Item
Rated Input Motor
-1
Speed (min )
Max. Allowable
Input Motor Speed
-1
(min )
Rated Torque
(N m)
Lost Motion
∗
(arc-min)
Torsion Rigidity
∗
(arc-min)
Angular Transmis-
sion Error Accuracy
(arc-min)
* See the following graph for lost motion and torsion rigidity.
(2) Noise Data
The following noise data for a servomotor with a gear is for reference only and may slightly vary with the capac-
ity and gear ratio of the servomotor.
Measurement Conditions:
• Scale A: 50 cm (19.7 in)
• Ground Noise: 28 dB
Terminology for Servomotors with Gears
Measurement Method/Definition
The rated output torque of the motor is the gear input torque.
The rated torque is this value multiplied by the inverse of the
gear ratio and efficiency.
Angular difference in the screw with a ±5% rated torque
load. (Maximum value at any four positions during output.)
Highest torsion angle value on one side with a ± rated torque
load
Difference in absolute accuracy for one rotation under load
and no-load conditions during output.
Lost
motion
- Torque
Torsion
rigidity
Rated torque
100
Initial Noise
50
Level (dB)
−
−
Torsion
rigidity
+ Torque
±5% Rated torque
Rated torque
1000 2000
Input speed (min )
3-46
Typical Value
Standard
Low-back-
Backlash
lash Gears
Gears
3000 3000
4000 4000
− −
20 max. 3 max.
27 max. 10 max.
15 max. 6 max.
Torsion
rigidity
4000
3000
-1